A device for indicating the failure of an electric apparatus comprises an indicator, a fastener and a spring; the indicator and the fastener are arranged in the base of the electric apparatus; the indicator and the fastener are provided with a buckling-locking surface and a locking-buckling surface which are capable of realizing self-locking respectively; the indicator is provided with a white indicating surface representing a normal situation and a red indicating surface representing a failure situation; and the spring provides suitable self-locking force for the indicator and the fastener and provides a driving force for the indicator to be converted from a normal state to a failure state. When manually opening and closing the brake, the white indicating surface is always locked in the window of the base so as to indicate that the electric apparatus is in a normal state; when the electric apparatus fails and trips, the indicator and the fastener are released and rotate under the action of the elastic force of the spring so that other red indicating surfaces enter the window of the base so as to indicate that the electric apparatus is in a failure state; and the memory of the indicating state is not finished until the manual closing operation of the electric apparatus is carried out. The failure indication device has simple structure, good safety and reliability, low preparation cost and wide applications.